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Answer Posted / perservance
it is used for earth fault protection,this kind of C.T
covers all the phases ,the secondary side of it is
connected to trip coil of CIRCUIT BREAKER.Under no fault
conditions the vector sum of all the three phase currents
is zero so no output to c.t secondary but when there is a
earth fault ,the sum would not remain zero and the trip
coil would act and circuit breaker would trip.
the disadvantage being that it would not detect phase to
phase fault,seldom used,not seen anywhere in my plant.
| Is This Answer Correct ? | 119 Yes | 13 No |
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